I have trouble with colors too and I've been making quilts for years. Sometimes I just pick up fat quarter bundles that are already color coordinated or fabrics from the same fabric "family". But often I'll get a print fabric that I like the colors in it, whether I like the print or not, and find colors that are in that fabric. If I don't like the print I'll put it back on the shelf and just use it as a color guide. The little color dots along the selvage may help some too with finding coordinating colors for you. Just remember to get some lighter and some darker fabrics. (See the post above I wrote about "gray scale".) To me, picking colors are the hardest part, but I find I am way pickier than I should be. There are plenty of prints and colors that look great together in a finished project that might not quite suit my fancy at the store.