All these rhythms are based on a 2-count, on which we add some hurries with the following combinations:
Selfs: make a synchronous self-zip with the self being either straight
(3x: half-box), or cross (3: shower).
Passes: Either the 2 jugglers do straight passes, or one of them does cross passes and the other straight passes.
This gives us 4 possibles combinations.
Being able to juggle the box or the shower on singles will help.
1- half-box, straight passes
This one might be the easiest. Upon receiving a pass to the LH, throw a RH straight self and a handacross LH to RH at a the same time. When the self comes down again, throw the handacrossed club. Both jugglers do straight passes. Not an ambidextrous pattern!
2- half-box, straight and cross passes
Same than above, but one of the jugglers cross his passes. The result is a nice ambidextrous rhythm.
3- shower, straight passes
Upon receiving a pass to the LH, throw a RH self to the LH and a handacross LH to RH at a the same time. When the self comes down again, throw the club you've just caught. Both jugglers do straight passes. Ambidextrous pattern.
4- shower, straight and cross passes
Same than above, but one of the jugglers cross his passes. Passes are made twice in a row on each side. Rather a difficult one.
On the same principle, you have to try out what the 3-count has to offer, especially if you juggle a box instead of normal selfs. In fact, you can try on any rhythm to replace the selfs by some synchronous selfs-handacrosses. PPS somebody? :-).