What should i get my friends as a Farewell gift?

Something really personal. Like you should put the letter in a picture fram and kinda decorate it with things that happened in the past. u can write lil quotes of inside jokes ya'll all over it or draw lil small pics of things that way when years go by they can not only read the letter you wrote but remember all the laughs ya'll had together. Idk if ya'll are into tattoos but thats what me n my friends did when we graduated and went seperate ways. We all went and got matching tattoo's so everytime I look at the lil puzzle peice on my wrist i know that there 8 other ppl that have matching pieces. You can go to the dollar store and get lil scrap books and take all the pics ya'll have together ALL OF THEM that you can find and put it in there and do a nice scrap book. But you want it to be something that they can have forever and something they can look back and remember not only you but the good times ya'll had like it just happened yesterday