This is an area where SmartThings shines. There are two third party browser based paid apps, ActionTiles and SharpTools, which are both very popular. Either is highly customizable and can work on Almost any WiFi tablet. And you can buy an elegant mounting case if you like to get the look you want. Here’s a recent discussion:
Otherwise you just choose any of the many available hue apps you like and use that. And again there are many cases available these days designed specifically for wall mounting so you have a lot of design choices.
Depending on the tablet you choose, you can also add a “kiosk” app to control the display features, such as locking it to a single app, if desired.