A trick I use for abstract sigs are... A c4d or you can just use the render your using, some smudging some bright settings like color dodge, screen ect. Lens flares. Lots of filters and curves. Throw in a brightness and contress and your set.
EX: You can get something like this.. I used the render not a c4d.
I havn't made a sig in a month and I came back and made this.
Tutorails! Help you out alot! use them thats how I got better fast. They teach you styles.