I enjoy picking out fabrics and color schemes. One time a student of mine said to me - You can take the ugliest fabrics and make them work. I guess that was a back handed compliment, but I'll take it.
Get a color wheel and play around with it. Another oldie but goodie hint is to find a print that you absolutely love. On the selvedge there are usually dots that are used by the fabric printers to create the print. Each dot represents a color in the print. Use these dots to find coordinating fabrics that have those colors in them. Sometimes, I don't even use the original print in the quilt.