Once you’ve got something you like, try shifting it out of your normal speech pitch pattern by using steps (one note up or down), skips (a third up or down) or a leap (a fourth or more) between words.
The simple, digital BOSS DD-7 is small, durable and has the ability to tap delay time very accurately. Another unique pedal, which has its own sound entirely, is the VOX Delay Lab, which offers a pitch shifting delay mode to really turn your signal upside down! It will add one octave up to the note you are playing as the first echo you hear. The second echo you hear is an octave up from that, and so on… It’s such a dreamy swarm of tones, you should give it a try at your local guitar store sometime! As much as I love this pedal, it’s actually enormous, and no longer fits on my board, so for something a bit more compact you can try the BOSS PS-3.