I found a theme that uses blockland's jumping sound :O

[espio100]

The background at the loading screen is a pre set gradient in photoshop fyi.

[Ad Bot]

[Blockchip]

I think Blockland just uses a lot of stock sound effects.
The explosion sound effect in Blockland is also used in Puzzle Pirates.

[Lord Tony®]

A lot of indie game developers can't surprisingly afford their own recording studio.

[Otis Da HousKat]

The background at the loading screen is a pre set gradient in photoshop fyi.

You can see that gradient in about a million places online and in real life.

[HooperScooper]

You can see that gradient in about a million places online and in real life.

like in spongebob

look at the chrome reflection