I hope you don't take this the wrong way but I suggest some variations beside change in color. Like maybe instead of a circle, give some others a diamond around it and such.

What's your paypal? I was looking to see if I would be interested in buying one but I can't but I can just donate some money. They would have been $10, right?

Honestly, I am happy to take in that advice. Advice is always helpful as I am completely new to making adopts as I've never done it before and I've not been good with art but am willing to try.

My PayPal is: blaze.watersage[at]gmail.com

Other advice would be base it off irl stuff. Like a tiger-stripped one or one with a rottweiler fur pattern (but different colors) or something. Maybe colored like a siamese cat. Yes it would take more effort to do but that way it'll have genuine effort/personality, at least to me.

That's a good idea. Maybe some with extra patterns and such.

Also very last bit of advice, depending on what programs you have, mix bases to give them cute hats and stuff.
[Unless you're really good at making them yourself.]

I made this: https://sta.sh/021usnu3k6ku
Using a base by: https://www.deviantart.com/shadowwolfbases and https://www.furaffinity.net/view/20365106/

And then I just copy and pasted (while transparent) in ms paint and tweaked it. Obviously it would need more tweaking to sell as that one isn't great but it's an example of what I mean. I could honestly probably copy the images onto a random paint file for you since I don't know if you have SAI or anything that can open it. Just make sure to properly credit/link if you used them.

https://sta.sh/01x4gdoelh8m <-- here's some of them I took from their free bases.
So would just be something like: accessories from a based made by https://www.furaffinity.net/gallery.....648/Free-Stuff

Not 110% if this is allowed but the base is free to use and they even have "PLEASE feel free to edit/move the linework with
each other to make it work best for you!" sooo should be okay.

I have made some more and slowly getting there. All I have is MS Paint honestly so I'll do my best to add to the base I am using. Maybe I could try other bases and draw more accessories on them over the weekend might help on Batch #4.

Which I did my espeon using just ms paint. With clicking down the "select" spot with the square above it so I could tell it to be transparent so I can put the white on white. It requires a bit of tweaking when it comes to coloring and lines but I think it's worth it to make it a little cuter.

I can make it transparent with that tool??? I actually didn't know that

I don't know if you have the newer version (I had my friend download me a classic version) but yeah. I imagine they always keep something similar.

https://sta.sh/09cfu3c753a <-- here's how I did it.

Oh yeah, I do have that option. Dang, surprised I never noticed the drop arrow selection. O.O

Haha. I'm not. Most people stopped using paint how long ago? Or used it to make silly cube designs and stuff. I've just always been a fan.

I've always been most comfortable with Paint as that's the main artsy tool I grew up with