This thing is nothing fancy, but it’s one of those things that I think is pretty cool because of how it started out … as a grey background with light grey triangles:

^ I made a triangle, positioned it randomly, repeated this a couple dozen times.
I had no idea what I was doing at this point.

^ At some point I got bored of doing that and started selecting (magic wand), filling, and blurring parts of the triangles.

^ MOTION BLUR! Now we’re getting somewhere awesome.

^ Added type, duplicated the blur, adjusted the colour.
At this point I decided that grey and easter colours weren’t going to cut it.

^ Enter vibrant purple-pink!

That’s about it.
There was tweaking to the type (masked bits of it) and added some texture and warmer colours to get the final result.