If you dont really care about fidelity and just want to create, just change them to “Stretch to square power of two” its less than ideal due to pixel shifting/stretching etc but you have to be a AAA stickler to care, or moreso when you start to care, you will have the knowhow to correctly work with textures anyway.
If i keep rambling im not 100% sure the difference doing this as opposed to padding and adjusting texture UV’s…
If somebody smarter than me wants to interject, please.