So, right. I need a bit of help with finding melodies for my music.
I have a handful of riffs that I feel could really be onto something, but I phail at song melodies. When I try to just play the riffs and sing the first thing that comes to my mind, my mind tends to go on vacation and I draw a complete blank.
I realize I may not have very much talent in the melody department, so I figured I have to practice.

So: anyone got any tips for writing song melodies?
The genre I'm looking for is pretty straight rock, with strong elements of alternative and metal.