Sikebo has done a variety of awesome icon packs including Matertialistik, Retrorika, and fl3D. Materialistik is, as you probably expected, based on Material Design and has a ton of colorful icons. Retrorika still follows the Material Design theme, but uses muted colors and retro color combinations to give your home screens a vintage look. The fl3D icon pack is unique in that it’s a 3D icon pack which is rare these days, but it looks sharp. The prices vary but most of them are either free or $0.99.