I use solids in almost all of my quilts! They can be dramatic or peaceful, depending upon the colors selected and the design. I do mostly "modern" type designs, and most modern quilts use solids more than prints. If you are a traditional quilter, this may be why you have rarely used them. Just try mixing in some coordinating solids with your prints to get started. Using only solids in a quilt can really showcase many designs more than print fabrics that can distract from the design. Go for it!