Thank you! I found the RandomColors script very useful but I needed to be able to choose the width/height of the color blocks.
I modified the script a bit allowing the user to choose the size in pixels of each bock and the distribution of the blocks between Noise (the current behaviour) and Stripes (both vertical and horizontal) I leave a link to the modified script below in case someone finds it useful.
(PS: I hope the creator doesn't mind this and sorry for any bad practices in the code you find, it's my first time using LUA D:)