Here are some shoot'em up level tile blocks. Most are 50*50 pixels, but some are a little bit larger.

There are two color themes, yellow and green, and also I included some concepts of how the blocks look like when put together.

These graphics were somewhat inspired by the Level 4 of R-Type 2; random "technology stuff" surrounded by yellow borders. :)

Attribution Instructions:

These graphics are in the Public Domain.
Attribution is not needed.

But if you wish to give me credit, then you can mention "Master484" as the original author, and maybe also put a link to my website: http://m484games.ucoz.com/