It's been a little awhile since I've done one of these practice loops, but this one has really been coming in handy lately for both teaching and my own practice.
This comes from the opening track of Rosa Passos' 2011 album É Luxo Só named after the Ary Baroso tune of the same name that is very much a Brazilian standard. The whole album is an absolute clinic of samba and bossa nova drumming.
The loop below is simply Barata playing surdo and a telecoteco pattern on tamborim, leaving lots of room for you to try things out with it.
And, as there is no harmony or melody on this loop, you are free to practice on both sides of the rhythm, feeling it like this:
...or like this: