the top row of the top rack is new, but been jamming with the rest for about 2 years now. i jumped into eurorack with mutable instruments because i was interested in making ambient electronic music with 'organic' sounding sources.
when i started making ambient with this system, i usually began with a drone from Elements, using the bow or blow or the chord mode, using shades to keep a gate open. i'd have output from Tides (before Just Friends was in) mult'd into various parameters of Elements (damp, space, timbre), and pass the audio through the SMR, using the envelope followers to create modulation feedback loops in the patch.
then i got really into Rings + Clouds, and ended up with two of each. i like using the two Rings to create two guitar players playing off each other, usually one down in the bass range while the other plays a melody, or two melodies playing together.
i like that Elements, Rings, and the SMR are all resonating modules, making it easy to have them work together to produce sounds.
i also like producing ambient music from samples, and the 2x Clouds and now STS are great for that.
besides sound sources, the next most important thing with ambient is modulation, and, for me, having related and interrelated modulation. my LFOs are always influencing each other in some way, either by FM or waveshaping. Tides and Just Friends work really well together for that purpose. sloths is there for the super slow or subtle massaging. Added Batumi recently because I'm always using every output from JF and Tides. this is also where attenuation becomes very important - luckily many of the Mutable modules have little attenuverters. to avoid drastic modulation and keep it ripbanana, attenuate when u modulate.
for sequencing, i mostly threw very simple sequences into the M32, often using an irregular input clock, but got an Ornament and Crime a little while ago and I can't recommend it enough for generative ambient music. the quantizer apps include several flavors of generative pitch production, from the humble turing machine (4 of those alone sounds wonderful) to integer sequences and bytebeats.