Welcome to "The Art Of The Riff". I wrote 10 different riffs for you based off my of most use a favored modes. Writing riffs is all about attitude. The goal is to evoke movements and emotions to suck your listeners into your music. Study these riffs closely and use them as inspiration for later projects as you like but avoid plagiarizing of course. Ripping off my favorite artist is my favorite past time as paying homage. But try to be as original as possible whilst progressing forward.
Your going to get 10 play-through videos, 10 mp3s, and scale/chord diagrams to supplement the material. So what are you waiting for? Get writing!
Best of luck,
The Art Of The Riff
10 Play-through Videos