This app was mentioned in 2 comments, with an average of 2.50 upvotes
It's Tha Black Krom from the Play Store. I use Action Launcher instead of the default launcher and it lets you, along with many other things, change the icons.
Individual app links for those not wanting to look at the dev page.
BLACK KROM - https://play.google.com/store/apps/details?id=com.thaphlash.blackkrom
CUTBOARD - https://play.google.com/store/apps/details?id=com.thaphlash.cutboard
DOT - https://play.google.com/store/apps/details?id=com.thaphlash.dot
DROP - https://play.google.com/store/apps/details?id=com.thaphlash.drop
BLK - https://play.google.com/store/apps/details?id=com.thaphlash.blk
GLASS - https://play.google.com/store/apps/details?id=com.thaphlash.glass
HOLE - https://play.google.com/store/apps/details?id=com.thaphlash.hole
KEX - https://play.google.com/store/apps/details?id=com.thaphlash.kex
GLASSIK - https://play.google.com/store/apps/details?id=com.thaphlash.glassik
MERCURY - https://play.google.com/store/apps/details?id=com.thaphlash.mercury
METAL - https://play.google.com/store/apps/details?id=com.thaphlash.metal
OUTATIME - https://play.google.com/store/apps/details?id=com.thaphlash.outatime
RAISE - https://play.google.com/store/apps/details?id=com.thaphlash.raise
SPHERE - https://play.google.com/store/apps/details?id=com.thaphlash.sphere
13 - https://play.google.com/store/apps/details?id=com.thaphlash.tha13
MERCERNARY - https://play.google.com/store/apps/details?id=com.thaphlash.mercernary
3D - https://play.google.com/store/apps/details?id=com.thaphlash.threedee
RCADE - https://play.google.com/store/apps/details?id=com.thaphlash.rcade
STEAMPUNK - https://play.google.com/store/apps/details?id=com.thaphlash.steampunk
MINT - https://play.google.com/store/apps/details?id=com.thaphlash.mint