I've been wanting to get a bit creative with some slime/gunge recipes. What are some ingredients you all use or recommend?

Cake batter

I've explored a lot with this but cake mix red velvet marshmallow fluff also food coloring to enhance white marshmallow fluff

Cake batter for the win! but you have to get the water to cake mix ratio just right

Something Alana's very good at doing.

4 bottles of mustard, 10 cans of cat food, one jar of mayonaise, 2 gallons of spoiled milk, 1 bag of ferret kibble, 1 tube of ivermectin paste, 4 eye of newt and the spleen of a virgin

What ratio do you use Alana?

Ready made custard + green food colouring makes great green slime. I have gotten some cute guys slimed with green custard and it looks just like the real stuff; but given they typically come in 1L cartons, that means a lot of custard! Have to like vanilla cause it will smell of the stuff!

Also a packet of cornflour + a touch of warm water to turn into liquid + 2/3 bucket worth of boiling hot water which you then add some food colour too after thickening. Makes a good thick gunge/slime that doesn't smell ... this was my go to before gunge was for sale online.

I just buy the stuff online now mostly cause its easier to mix / prepare a bucket worth; and doesn't have any smell.

Edit: just saw you're in the US ... don't think ready custard is available. Do they do large amounts of ready vanilla pudding?

Also, when I say "cornflour" i think in the US that is "corn starch"

I loved the consistency of my last slime. I used cake mix (3 boxes), hot water, add a large scoop of emulsifier and mix all with a mixer.