Here's a few riffs i wrote that i couldn't fit into any of my songs.

All riffs are in standard tuning.

. = palm mute

Riff #1
e|-------------------------|-------------------------------------------|
B|---9----9--9-10-12109----|-12121010997710109977559977554477554455-x2-|
G|----9----9--9--9-----9---|-------------------------------------------|
D|--9----9--------------x2-|-------------------------------------------|
A|-7-----------------------|-------------------------------------------|
E|-------------------------|-------------------------------------------|

Riff #2 Part 1
e|------------12--10--9-----10-------|----10------------10--------------------------|
B|---------10------------10----10----|-10----10-10---10----10-9-x8(slowly fade out)-|
G|------12------------------------x4-|----------------------------------------------|
D|-9-12------------------------------|----------------------------------------------|
A|-----------------------------------|----------------------------------------------|
E|-----------------------------------|----------------------------------------------|

Riff #2 Part 3
e|---------------------------------|
B|---------------------------------|
G|---------------------------------|
D|-7---7777---7776---6666---666----|
A|-7---7777---7776---6666---666-x4-|
E|-5---5555---5554---4444---444----|
       ...    ...    ...    ...
Riff #3
|---------------------------------------------------------------|
|---------------------------------------------------------------|
|-77-7-7-7--------77-7-7-7---------77-7-7-799--77--77-7-7-75557-|
|-xx-x-x-x77--55--xx-x-x-x77--1010-xx-x-x-xxx--xx--xx-x-x-xxxxx-|
|-55555555xx--xx--55555555xx--x-x--5555555577775555555555553335-|
|---------55553333--------55558-888-----------------------------|
    . . .   ..  ..  . . .   ..   ..  . . .   ..  ..  . . .

There you go. Have fun!