Here are a few ideas that I hope may help you.

In rock, you'll often see simple fills like:

1234123412341234
RLRLRLRLRLRLRLRL

These can be spiced up, using simple rudiments. In general, useful rudiments that I've used as far as playing in rock bands, would include flams paradiddles (forward, backward, reverse, invert, etc., & the other diddles) of course. Your basic single & double strokes, including in the various 'rolls; 5 stroke, 7 stroke, 9 stroke, etc. Those make cool little fills on their own, or use them at the start & end of regular single stroke rolls. The swiss triplet can make
a dramatic fill when you do it going down the foams (i.e. do it once or twice on snare, then high tom, low tom... etc.)

Another great idea, is to take a rudiment like paradiddle, but have your left hand hit one drum & your right hand hit another drum. Or use the bass drum instead of a hand. You can create some cool beats doing this too.

And also, mix it up. For example, do a regular paradiddle, then an invert or reverse paradiddle.

Like this:
1234123412341234
RLRRLRLLRLLRLRRL

Another example:
1234123412341234
RLRLLRLRRLLRLRRL

or throw in other stuff with paradiddles:
1234123412341234
RLRRLRLLRLLRLLRL

And don't forget double & triple paradiddles:
you can get a clave type feel going - ESPECIALLY IF THE RIGHT HAND IS ON A HIGH TOM & LEFT HAND ON LOW:

1234123412341234
RLRLRLRRLRLRLRLL

Try that on a-go-go bells, or R on cowbell, L on tom—OR WHATEVER YOU LIKE!!

Theoretically, there are a million different patterns of alternating singles & doubles.

Of course, basic single stroke rolls will be a staple in rock, but spice it up sometimes with ideas like above. Also—LEAVE SPACES— sometimes it what you DON'T play that makes it special.

Instead of:
1234123412341234
RLRLRLRLRLRLRLRL

Try something like:
1234123412341234
RLRLR*RLR*RLR*RL

*= 16th rest (just drop a hit) do that switching to another drum after each rest,
(RLRLR on snare, RLR on high tom, then RLR on low tom) or whatever.

or:
1234123412341234
RL*LR*RL*LR*RLRL

(bases on sets of 3 16ths-
hit hit rest, hit hit rest...)

Remember— ALWAYS HAVE FUN !
AND USE YOUR IMAGINATION ! !