Another small update. This time the problem with the bottom screen image was not so noticeable but I fixed it anyway. The most important thing was the SFX, I felt I left the volume too low so I just turned it up...as for the music, I guess it wasn't too bad but I still decided to change it. I guess that would be it :).
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Credits:

Mario, Luigi and backgrounds (animated and non-animated) by: Mister Man. Princess peach sprites by: Barack Obama, Davias and Sunny Cassette. Yoshi sprites by: Barack Obama, P-tux7 and sonikku. Title screen by: Alefy San, Daemoth and GregoryTheGamer. World map by: Alefy San and Badassbill. World map border by: Dogtoon64.
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Original description:

(I was not satisfied with the original theme so I modified some things, mostly the top screen, the music and other minor things).
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Both the top and bottom screens are a collection of different sprites and resources from the game taken from TSR (thanks to all the people who ripped the sprites I used for this theme!). The color palette of the buttons is based on the colors of the game logo. This theme also includes a custom folder image, custom cart icon and sfx. (also, the folder image and the cart icon were made by me. the folder is based on yoshi's mailbox and the cart icon is based on the item storage).

Title BGM (SMW-album) - Koji Kondo