A lot of games, Messy, materials, give us ideas haha!!
Many materials as possible don't be shy

A running gag where one of the girls is glammed up and inevitably gets plastered with mess at the end. One time looks like she s got away with it, but ends up thrown into mud or mess

You both mix a ton of gross ingredients into a bucket.

Then you roll dice, and take turns drawing cards from the top of a deck matching the number rolled.

Whoever draws queen of spades does this:

https://dl.messygirlvideos.com/cgi/autogal.pl?vidnum=tws-75-0857

I've signed up for a custom. Excited to see how it turns out.

That's a bit vague, can you give more information into what you're looking for?

This is a good idea!!!

A turning wheel?! if it lands on "Cash" she gets cash. It could land on pie! or butt-smother! or slime or wedgie?!

It would be good to try and the rather formulaic approach of most videos along these lines.
Rather than the 'loser' getting a huge gunging, or the wrong answerer gtetting a pie or messy surprise, perhaps a series of forfeits for the loser of each round.
I'll think more about something that might work.
M

They can make like a cooking tv show.
A girl cook and her assistant dressed only in aprons prepare birthday pie. We have many ingredients such as flour, eggs, milk, chocolate sauce, whipped cream. The two girls have messy scenes and slapstick.Some dialogues provoke these scenes for example:
-use the head to break the eggs: take the eggs and break it on the head of the other
-do not throw the flour that expands: the other girl to show you what she said, takes a handful of flour in her hand and blows it into the other's face.
-You can dump the milk behind: and it throws milk on his butt
Continuing with the whipped cream, the chocolate sauce until throwing pies.
The two girls will finish themselves as sexy messy birthday pie