I have only seen pictures of her lovely little apartment, so I'm not familiar with layout.
First let's start off with a prayer room/corner or interesting accent pieces to liven up a hallway or weird little nook area of a room:
First thing I notice and LOVE about this is the border painted on the bottom of the wall. I've never seen this before. I would normally think you'd want to emphasize the height of a room, but this is about loving what you've got. Bringing the brightness around the very neutral furniture gives the space a little more depth. I also love the weathered look of this furniture for Caitlyn. I would accompany this bench with these pillows:
Now I like the idea of a mural, but this might be a bit much. I just wanted to show it in context with the textiles and furniture. Caitlyn has her own little corner with pictures like below. I like the idea of mixing the Candlesticks (you could find look alikes from Anthropologie or Urban Outfitters) and berry colored throws with something so ethereal. I would stick with a yellow, blue or green throw for Caitlyn. You could toss that over a prayer bench or console table. This also shows you could multipurpose the room for a guest room!
This is exactly what I would do for her entry way. I love how old school the furniture looks but with the modern artwork over it. She has red accents in the kitchen so this would help tie in that. I'm not a huge fan of the whitewashed flooring (*gasp...I know, I usually am) but I think a rich dark hardwood floor would bring a playful elegance with this.
Ok...not to make too dramatic a switch here, but this is how I imagine her kitchen. Bright, sunny, eclectic and full of happiness. She already has a little red table. I would add bright yellow or turquoise chairs to that puppy! Get some vintage seat cushions made with a fabric similar to the upholstered chair here. Keep your accessories porcelain and fun. The quirkier the better. Keep the kitchen cabinets white along with your window treatments.
Finally the den. I would make the space simple and symmetrical for a clean look. Use interesting fabrics and patterns for visual interest. Obviously the architecture gives this space a romantic feel to it, which is lovely, but you also could achieve this with your accessories. Pretty vases, artwork, anything floral. I would keep all the big things neutral like paint and bigger furniture. I would, however, add a printed rug (like below) instead of keeping that solid. 
Rug:
I also use pillows with a more modern print:
Well there you have it. Caitlyn's space is already adorable. You can see it here. Hopefully you can drawn a little inspiration from these posts. I've already gotten great ideas for myself!
This will tie in all her African-themed wall art, decor items perfectly!
Now onto the dining room. I have 2 options for this. First, eclectic charm. Her dining room is smaller and doesn't have alot of wall space due to the layout. One wall opens onto the entry way, one to the den, and one with a doorway to the kitchen. So, I would actually go with a burnt orange since there wouldn't be too much of it and thus it would not be overwhelming. Ok, I don't usually love an ornately printed rug, but the Indian print of this works really well in the space. I would choose a darker wood for the table (like the piano) and surround it with a bunch of yellow chairs! Too cute with the yellow chair from the den right?! :) I also love some floating shelves in a dining room to showcase your pretty china. The more random, the better!
Option number 2: natural grandiose. If option #1 is a little much...or you'd just prefer a more formal dining room, stick with a light neutral for the wall. It will pop against the brown in den. I would still keep all the furniture a dark wood color with yellow as the accent. How much do you want that yellow upholstered couch! Oh...you should just buy that anyways! I would get a fabric like this couch and upholster the bench for her piano in it. *falls in love* You could keep the seating more formal with a lightly colored upholstered chair and keep the accents neutral and natural. (If you haven't noticed those antler chandeliers btw, you should. Yes...you might get tired of it, but what a statement piece!)
The kitchen: I like the sand color on the walls for here. Her cabinets are white with a counter top that has both beige and blue specks. It's really lovely. She also has sort of a bay window thing going on where the kitchen table goes. I like the banquet, but if it's not in the budget, stick with a white table and seating. Or be bold and make the chairs an orange or brown! I also love these pillows for anywhere in the house you can find a spot!
To die for!!! Paint it a striking dark brown (darker than the den) and put up 2 huge red flowers.
