How to edit the food items?
1.you must download the texture pack

2.you unzip it in your minecraft texture pack folder (menü->options->Resource Packs->Open folder)

3.you go in file BetterMatrix 1.0V -> assets -> minecraft -> textures -> item

4.now you can choose wich one you would like to change:
nether apple -> apple file
cupcake -> carrot file
pizza -> carrot file
icescream -> cookies file
cocoa -> honey_bottle file
sandwich -> bread file

5.open the one you want and draw and paint new but place dont change the .png name because than it doesnt work anymoure

6.have fun with better texture!