Overview
I have created descriptions and visual keys for making your own solid object tile set.
40×110 Tileset
There are several free software programs that can help you create a 40×110 pixel image, suitable for the solid tileset in Towerfall. The complication is in how Towerfall interprets these squares of 10×10 pixels. I have upload an image with a list of where each square goes and included a picture key of the 40×110 tileset and an example from the Towerfall editor.
Hopefully you will find these helpful when creating a level in Towerfall.