One thing I like is the battle market, but so far it is kinda disappointing that each artifact only uses one type of badge... so a few ideas for new battle market artifacts...

1.) Rage Induction Coil
type: ship module (weapon)
effect: increases strength of raiding by 10%. adds chance to kill 1 crew on opposing ship.
cost: red and yellow badges

2.) Cascade Field
type: ship module (defense)
effect: adds to shields = number of scientists on board
cost: red and blue badges

3.) Assault Mech
type: ship module (weapon)
effect: adds to invasion strength = number of tactical officers on board
cost: red and green badges

4.) Commandeered science outpost
type: planetary building
effect: +2 research, +100 cloak (doubles if on recently invaded planet)
cost: blue and green badges

5.) Slipstream boarding pods
type: artifact: X uses per purchase: use on enemy ship
effect: allows raiding on target ship without disabling it first
cost: blue and yellow badges

6.) Stockpile transfer center
type: planetary building
effect: increase capacity of (mineral/artifact/research) resources by 500 each. (doubles if on recently invaded planet)
cost: yellow and green badges

7.) System Defensive Net
type: Ship module (defense)
effect: + raid defense, +hack defense, +defense
cost: red, yellow, and blue badges

8.) Defense Control Center
type: planetary building
effect: +1 research, + to cloak, +to invasion defense
cost: blue, yellow and green badges

and of course the list can go on for each variant combination of badge colors

I think the idea of Multi-badge color items would be pretty cool, although I do think that a few of them might be a little overpowered, particularly the ones that add +(insert stat here) based on certain crew on your ship, cuz I know there are players out there with 8k + tactical officers (Remric comes to mind first for some reason). With a little tweaking, I think these would be awesome ideas though! big +1 from me