I love scrappy's they call me the queen of scrappy I put them together, the only time I change a piece of fabric is if it is the same color as the one I am attaching it to.
I love that I can take ugly fabrics and make them look prettier/nicer in a scrappy. And I like to make up a design as I go.
Sometimes there is no way to avoid two fabrics the same going next to each other but as long as it is not a constant I don't worry about it.