Well, for starters prestidigitation and druidcraft have a chunk of overlap. Creating sensory effects and lighting and snuffing fires can be done with prestidigitation.
Druidcraft then gets predicting the weather and blooming things and opening seed pods (which I presume to be how you did the peyote and blinding).
Prestidigitation gets:
cleaning and soiling, which lets you keep your clothes clean, and can instantly dirty the clothes of someone else. This one is mostly for social stuff (soil the clothes of a noble on his way to a party, and then use some other magic/disguises to take his place). Turn that slight spill of a beer in a bar into a complete brawl-provoking mess.
chilling, warming, flavouring. Your food is always hot, your beer is always cold, and even the worst cooking tastes great. As others have pointed out, you can cover up the taste of poison (or alchemist's fire, or acid), or make someone think they've consumed some. You can make someone else throw out their delicious food. If you make the centre of something taste truly foul you can probably get someone to hurl or leave the dining table hastily.
Create a nonmagical trinket or illusiory image. As others have said you can show pictures to people "Have you seen this man?". You can also pull off some elaborate bluffs "Oh yeah? Well, we already STOLE the amulet of oblivion! It's right here in my hand! You just have the fake that we replaced it with!". The trinket list includes some useful stuff, like knives, coins, rings, keys and unbendable needles.
Thaumaturgy is a lot more limited. Booming voice has obvious applications, from making yourself heard at a distance, to enhancing your oratory performances. Potentially you could temporarily deafen someone by yelling in their ear with it? Shouting point blank is about 88dB, triple volume adds 30dB to that for 118dB. The threshold of pain is 110dB, so temporary deafness is a distinct possibility. Various singers can reach 105dB, so you could probably get to 130dB with a decent performance score, which is going to cause permanent damage from an instant exposure, and almost certainly deafens and disorients in the short term. If you manage to get a world record loudness in the first place (121.7dB), the 30 extra takes you to eardrum rupture levels.
Flickering, brightening and dimming flames has some uses for stealth.
Tremors should be able to mess with foes that rely on tremorsense, probably in the same way that darkness does: penalties and the ability to hide from them.
Creating sounds - again has some stealth applications, along with signalling your friends.
Opening and shutting things! With some prep you might be able to create something that releases or triggers something more dangerous on the opening or closing of a small door or window. Apart from that, opening a door at range can be useful on any dungeon doorbust.
Ooh I didn't think of Stealth implications for snuffing out flames I guess in trying to be all fancy I'm overlooking common sense haha.
I love your concept of using Thaumatrgy to deafen someone, as well as distracting a noble with a dirty robe and taking his place, I would love to see that used. With all these good suggestions my Party member should have alot of interesting ideas to use in our next session so we can both spice up and annoy my DM for a few hours XD. And bluffing a magical object of supreme power is beyond amazing. *Casually holds up the Necronomicon* "I'll open it. Don't test me."
Thanks again
