I would suggest using a variety of sizes and shapes. Pillows are a great way to inject colour into a room, and you can change the look whenever you want. The trend right now is to use an eclectic mix of prints or patterns interspersed with a solid colour or two. Hope this helps! :)

Great idea. I've heard places like Home Depot can match just about anything you haul in there. SW Pavestone is actually a pretty decent match to the gray'ish section of the bigger six sided patchwork pillow. I think the gray stripe in the round pillow is going to be lighter, maybe like SW Requisite Gray or BM Revere Pewter.

Thanks for all the great ideas. I do like the idea of using ticking stripes; but the room already has a stripe in the lampshade, which is right next to the window. If I get the striped curtains, I'll probably change the shade. I will definitely order some sample fabrics from Country Curtains. I'm still drawn to their toile curtains, even though I don't want an entire room of toile. This is sort of how I envisioned the toile fabric working with the red floral pillows. (Thanks for the link to the toile rooms. That's where I found this picture.)

Link to the blue/beige velvety pillow I'd posted above. It's from etsy but apparently not available right now. https://www.etsy.com/listing/80146732/sukan-pink-ikat-pillow-pink-cream-modern As far as the current rug, I can see it in the fall/winter with brighter cushions or with blue/white to play on the Chinese ceramics (and some brass/gold). I'd get IKEA solid velvet pillows and their down inserts. They are very inexpensive (8.00), so you can swap them around.