I like to put angular quilting on quilts with curved piecing and swirly designs on more angular quilts. My 2 fav sites besides Pinterest for helping with quilting choices are:
www.theinboxjaunt.com cute motifs that she demos step by step. Lots on her site and a book if you want them all together.
Whirlsnswirls quilting on Youtube. She is almost done with her 4th series of 100 free motion quilting designs. not all of them are my cup of tea. I always find inspiration there!