I took the great design of an "Minecraft diamond ore lamp" by "I_am_me" and addet a base suiting my conditions. The base offers enough space for a battery box with 2 Mignon batteries which power 4 RGB LED's. I also added 3 little switches to control each color seperately. As a light-diffusor I used semi-transparent paper.

In case you have any questions on this thing, feel free too ask me.

Links:
Battery Box: https://www.amazon.de/SBH-321-1AS-Holder-Batt-no2-cables-Colour/dp/B01B5UQOEO/ref=sr_1_fkmr0_1?ie=UTF8&qid=1539435622&sr=8-1-fkmr0&keywords=TRU+COMPONENTS+SBH-321

Switches:https://www.amazon.de/Wippschalter-2-polig-Montage-Einbauma%C3%9F-SK-7219-1x/dp/B079XXN2BT/ref=sr_1_2?ie=UTF8&qid=1539435691&sr=8-2&keywords=Wippschalter+klein

LED's: https://www.amazon.de/RoXane-50Pcs-Gemeinsame-Kathode-4-Pin/dp/B07HG5RVLX/ref=sr_1_3?ie=UTF8&qid=1539435722&sr=8-3&keywords=RGB+LED+diode+3V