I don't know if this has been done before (it probably has), but I got the idea from the Colored 3x3x5.

3 colour cubes like this one do exist, they're a fairly common sticker modification. You may want to change the name of the puzzle, you don't want it to get mixed up with Tom's 3x3x3 + Rainbow Cube.

I did a 3 colour cube once, though it had solid sides, it was white, red and blue like normal, but then opposite them was the same. I like having some simpilar cubes in my collection. Yours is interesting.

My store will actually be selling something with a similar idea, except instead of different stickers, we decided to switch pieces using DIY cubes. They aren't on our website yet though.

We did Red, White and Blue ones as well as Blue, Pink, and yellow ones.

They look really cool and are fun yet unchallenging to solve.

I dont hope this would be concidered off topic but

Don't you think it would be a good idea to have beginners solve this cube before trying a regular color scheme 3x3x3?

Also, how fast do you think you can solve this one?

Yes and it takes me around 40 sec since the cube sucks and I have to be careful with the paper stickers but if I did't have to worry about that it would be around 10-15 sec.