In your app you could easily make icon/cover selector from more than 10 000 icons
{"items": [{"title": "Icons8","icons": [{"png": "https://rd-icons-icons8.gumlet.com/color/5x/mystic-pokemon.png?fill-color=transparent"}]},{"title": "Iconfinder","icons": [{"png": "https://cdn4.iconfinder.com/data/icons/pokemon-go/512/Pokemon_Go-01-128.png","svg": "https://api.iconfinder.com/v2/icons/1320040/formats/svg/1760420/download"}]}],"result": true}
{"items": [{"title": "Colors circle","icons": [{"png": "https://up.raindrop.io/collection/templates/colors/ios1.png"}]},{"title": "Hockey","icons": [{"png": "https://up.raindrop.io/collection/templates/hockey-18/12i.png"}]}]}