Thanks for the answers everyone.
Luckily an addon for Futalicious just came out, so I will be using that for now. :D
But I will probably use a custom texture, the default ones are looking quite pale…
The limited textures for Futalicious are its main downfall if you ask me, and I hope Meipe or another vendor addresses that soon. For now, I use Photoshop to alter the color settings on the existing textures until I get something that works. Also keep in mind that the shaders, not the textures, on certain characters simply do not play well with Futalicious regardless of the texture on the pecker. In that case, Studio has a neat ability to replace the shaders on your character while keeping the textures intact, simply hold down CTRL when you click on the textures file for a character that you know works well, and it'll give you a popup where you can replace or ignore the image files. Select ignore and you're on your way. My go-to shaders are Rhiannon's 'Saffron' character, they seem to work great pretty much all the time.