How many cabs have space based background art. Isnt it time for something a bit more original. Its so cliched. Lightning , space, grids and fire. Theres some amazing artwork coming out of this forum, real insperational stuff. We have etched plexi art, hand carved 3d artwork, airbrushed work, custom character art. For the love of god dont end up with one of these space based CP's just because you cant produce anything else 
Cliched?!? Are you kidding? Aren't arcade machines themselves cliched? Yes there are numerous space-oriented cab themes out there. Given that:
- the majority of cab builders are technically oriented people who enjoy doing things themselves
- most of us are not graphic artists with cartoon talents
- many of the games are space-themed
....it isn't too surprising to see why the space themes are so prevalent.
Certainly those with the means and the will to commission custom professional artwork to adorn their cabinets are welcome and encouraged to do so.
But for many DIY cab builders with only a casual familiarity with Photoshop or some other editing app, space themed artwork is familiar, recognizable, and easily obtained to work with.
Yeah, there are other ways to go, but I don't think the OP should be shamed away from going with something space-themed.
I'm hoping to start a driving cab soon. Obviously my artwork for it won't be space-themed. But given my limited graphic art skills, it will be limited to modifying and assembling artwork I can find suitable for the end effect. In fact, I plan on it as a dual use driving / flight sim cab. Artwork for that will indeed be interesting.