ShellyQ

You can use the sew and flip method to add triangles to blocks and make all sorts of patterns, Barb M posted some really good instructions on using this method to add triangles to log cabin type blocks in the May 1st BOM for the Buttercup Block, here is the link
http://www.quiltingboard.com/posts/list/6696.page

Also below are a few ideas, just to get your creative juices flowing :P
A: Single Bow Tie

B: Medalion Bowtie

C: Cross Bowtie

D: Cookie jar block, rectangle with squares added to corners to make triangles

E: Snowball Block, square with squares added to the corners

F:Simple Flower, squares with different sized squares added to make the units