Something to consider...

Karmine leather craft are newish and have a decent selection of veg dyed kangaroo leathers.

They are 0.8mm to 1.3mm so should be good for boxes where pig-skin splits might not be desired.

Leather Karmine Leathercraft

e.g. Inspiration Packs Karmine Leathercraft


(not a customer, nor a purchaser yet, simply thought the source of coloured leather would be useful to others)