Nightwing
I built Nightwing using a Green Lantern base with a Clark Kent head.  First, I removed Clark's glasses with my Dremel.  Next, I removed Lantern's ring and the circles under his arms with my Dremel.  I then sculpted on Nightwing's collar, bracelets, and boot tops with Sculpey.  Next, I primed the figure and painted.  The yellow wing portion of the costume was extremely difficult.  It took alot of patience.