I'm a blender user! Still learning things, but already went through the donut tutorial, did a low-poly model of one of my creatures and have some ongoing WIPs :P
Well, I looked up "free seamless textures" on my browser, and a bunch of options popped, from sites to images. The first place I stumbled upon was this site: https://wildtextures.com/category/options/seamless/ I'm sure you'll find even better things if you use specific terms in that search :P Wish ya luck, and hope I helped in some way!
Sick in internet slang usually means "rad" or "awesome"!
isn't the rad or awesome meaning of sick just the british slang not internet slag
slang*