A number of textures for use, which you can install in your interiors directory. The reason for the very large size of this download is due to the provided PSD files.
This is Blasted's Custom Multi-Player Level Pack. :) Note: I tried my best not to make any mistakes on the .mis files.
A wallpaper by MarbleDuck.
Some wallpapers from Technostar
Phil's Skies 1.00 Four skyboxes from Phil to download.
Some stuff...?
The levels for December 3-9.
Corner, Jump, Aim! 2.0.0 
Shuan's Skies 1.00 A couple of skyboxes to download
Texture pack for pads.
Half-Pipe Launch 1.00 
A help trigger sound effect with chimes effect.
Upgraded map2dif compatible with MBG.
Features:
- The upgraded map2dif_plus conversion engine (converts more maps, with fewer limitations)
- Does not save LightMaps by default (as MBG makes no use of them)
---- reduces file size
---- to re-enable saving, use -p on command line
Mac OS X 10.6+ GUI Tool for the Marble Blast Map2Dif and Map2Dif Plus converter scripts.
A couple of loop shapes
A custom Gyrocopter shape.
This is my marble textures to use with any MB mod.
Crazy Roads v1.0 1.00 
This is Blasted's first successful level and it is MultiPlayer in SP! Put the .mis and the .jpg file in your missions file. Put the rest of the items in your custom folder, if you don't have a custom folder, make one!
A skybox for download.
This Level Pack contains Five Classic Marble Blast Gold Levels adapted for Multiplayer in MBP 1.50. The levels Include
- Skate Park
- Tornado Bowl
- Freeway Crossing
- Jump Jump Jump
- Thrill Ride
Simply Copy the .mis files within the attached Zip to Multiplayer/Hunt/Custom Folder to Install.
A couple of textures are available. Install in your interiors directory.
Heaven Skybox for use.
Author's note:
The model you will have to enlarge to fit the sky and the sky you may have to change the distance to 50000 or more for it to be displayed.
Universes Coliding 1.3.1 
Something definitely unique. Put some of your problem solving skills to the test in this level to complete a never seen before challenge.
Overcome various obstacles and unlock doors to finish.
You can take the main path or just take shortcuts along the way.
*
* DifFix 2 for Marble Blast Gold *
* Version: 0.2 - Experimental *
* Author: Brian Lisbon *
* Mac Port by: HiGuy *
*
Info: DifFix2 makes DIF interiors exported from Constructor (Legacy TGE Dif) usable in MBG. It can also remove lightmap PNG images from the DIF, as MBG does not use them for lighting.