A nice paterned waltz is the Welsh FFarwell Marian. This is done
in a circle of couples with the men (or male equivalents) on the
inside and women on the outside. It does include some ballroom style
waltzing and can be done either retaining partners or as a mixer.
On the subject of women waltzing with other women. There are a
variety of gender neutral holds which can be used which are
frequently seen at contra and folk dancing around here. These
include: shoulder/waist, each person putting their right hand on
their partners waist and joining left hands underneath, and both
people holding their partners waist. Another very pleasant
alternative that was common in one group was trio or more waltzes
when good friends (of whatever gender mix) would get together in
groups and form a circle with arms around waists (sometimes in a back
basket hold) and waltz as a small social group.