I know this might not look too flashy, but this might be my favourite stamp sheet. These Estonian stamps are a language tree of the Uralic languages.
Going anti-clockwise from the bottom middle stamp, we have:
The Samoyedic Languages: Nenets, Enets, Nganasan, Selkup, and Kamasin
The Ugric Languages: Hungarian, Khanty and Mansi
The Permic Languages: Komi and Udmurt
The Mari and Mordvinic (Erzya and Moksha) Languages
The Sami Languages (Nortern, Southern, Skolt, Inari, Lule, Ume, Pite, Ter and Kildin Sami)
The Baltic-Finnic Languages: Veps, Karelian, Izhorian, Livonian, Finnish, Estonian and Votic
Languages in brackets weren't mentioned in the stamp, but I thought I'd elaborate anyway
Edit: put Ingrian instead of Izhorian. Should've known better, sorry
