All bundle knife skins that have color variants should have color variants for them as well.

Skins are the only way to differentiate yourself within the game from other characters, and the knife is by far the weapon that most appears to itself.

The prices charged by Riot for skins justify the extra design work of the variants, and all of them usually involve only a change in the color pattern, I honestly can't find any justification for the lack of variants for the knives.

I know that there are more important things to fix / create for the game today, but personally I find it unacceptable that they haven't been developed that way by default.