Any recommendations for UI colour themes?

As the title says, can anyone please recommend where I can find good user interface colours?

I'm currently working on an app, and I feel like the colours we have look like a cross between Thor: Ragnarok and an electronic water melon.

I'm totally fine with super basic colours: even Facebook Chat's label colours would work, but I need about 8 different colours that would go well together.

Thank you!