man anti aliasing can really make a difference
a revamped version of the SMB3 Sky theme from SMM2. Includes blocks, sizeables and BGOs.
The blocks and BGOs work in SMBX2 and SMBX38a.
The sizeables don't work in 38a afaik due to the use of 128x128 variations.
If you use this, please give credit; I don't mind recolours or edits or anything. After all, this is an edit.