Mods for Rubik's 4x4

[cuberkid10]

Since I recently got an Eastsheen 2x2, I no longer need to use my 4x4 as a 2x2. Now, I have an extra 4x4 laying around. Anyone know of a mod I can do with it? I can only sand and superglue. And I have some foam and filler to use on it. Thanks.

P.S: I only have 1 4x4 to use.

 

[Vulosity]

Squircle mod:

 

[cuberkid10]

I've already done the squricle mod on my 4x4. I think it made mine worse. I need mods kind of like a 4x4x6. (I can't make one of those.)

 

[Vulosity]

Hexagonal Dipyramid: http://www.youtube.com/watch?v=KtBEjukycvE

 

[cuberkid10]

Hexagonal Dipyramid: I'm waiting to mkae one from my Ice 2x2. but, I don't want to do it to a 4x4 because I'm new at modding. Thhe hardest mod I made was a 3x3x5 extended octogon barrel.