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Even permanent tattoo can be removed using laser technology,

I heard of it but there will be scars sometimes and it won´t look like there was nothing before

I looked into henna tattoo's which are 'sorta' an option for shorter term but you have to stick with the red stuff which I don't like, because apparently the black henna ink contains all kinds of horrible toxins. And it fades faster too of course, can't imagine it staying nice after the first few weeks!

Yeah sure, you´re totally right. I once used black henna on my hand and after 8 days it looked horrible. Red henna isn´t my thing so maybe you have to stick with bare skin then :D