Icon packs are great, but sometimes the icons aren't exactly like you'd want. If you use a launcher, you can often change the icons at an individual level. I use Nova launcher, so this is based on that app, but I'm sure others will work too.
I installed a recent update to my Motto Z Play and it adds these obnoxious white circles around some of my app icons. I have a black screen, so it's glaringly obvious and looks awful. So I went to Google images and downloaded the icons I wanted and switched them out. You simply long press the icon, go into edit, select the image and choose "from gallery apps." Then just choose the image you want.
Here's a screenshot of the same app with difference icons. The first is the obnoxious white one, the second and third are different options I downloaded.
Tl;Dr: you can make your Android icons anything. Anything at all.