Hey, question...

I been writing riffs for Verse's and to me they sound ok, the riffs I write for Intro's sound ok, and when I do a riff for a bridge it sounds ok. But as soon as I write a riff for a chorus, it starts to sound like crap. For some reason I just can not get a good chorus riff.

Lets say I write a riff that starts in D Major, it will come out fine, all the others will be fine, but come time for that chorus riff and it turns out like crap. Any suggestions on how to go about coming up with good riffs for a chorus?
yeah, MT is probably a better place for this. but they are going to want to know some stuff like what kind of music we are talking about here and things like that.