Hi Mirja Crimson!! Greetings from Flagstaff...
One thing that really strikes me as being very good about the 3-card spread is that it seems to be very
adaptable. I have a 3-card daily spread which I use;
2) peak or theme of the day
3) ending of the day
I have also used a "past-present-future", a "mind-body-spirit" and a "problem (issue)-blockage-solution" spread. Though for looks at past-present-future type issues, I usually use a 5-card line spread ("past-recent past-present-near future-future).
And... as Maan said... a "new deck" spread is a must. The one I use is;
1) What will you (the deck) teach me?
2) What do you need from me?
3) What will our relationship be like?
Hope this helps...