A dominant pattern that goes outside
Here is a sound sample played on trumpet:
How to memorize this dominant pattern in 12 keys:
You can see that this dominant pattern just repeats itself over and over again going up chromatically in half steps. Just start on the tonic of whatever dominant chord you are on. The pattern is (1 b7 1 b7 5 4) memorize that pattern in one key and you will basically have the pattern memorized in all the other keys.
You can use this pattern like it is written above, or you can keep going up chromatically as far as you would like. Experiment with this lick and find how it best fits into your improvising. You really could play this Jazz lick over any chord and it would sound good.