I created these audio assets through a combination of recording my own original sounds and editing together and manipulating a couple of pre-existing audio samples. Here's some more detail on each specific sound:
Time Stop
To achieve the core time stop effect, I reversed a glass breaking sample to get a nice glassy 'woosh' effect, and combined it with a reversed lightbulb pop sound to give it a percussive finish.
Glass breaking sample: GN2013, 'Breaking Glass Stereo' freesound.org/people/GN2013/sounds/199906/
Lightbulb pop sample: jorickhoofd, 'Exploding Lightbulb 2' freesound.org/people/jorickhoofd/sounds/179264/
Time Stop (Delay)
For this variant, I added a low rumble to the crescendo of the glass sample to give the effect a bit more of a dramatic, unsettling feel. I also added a tape delay to the glass and pop sounds to give the treble elements an eerie decay.
Wood Footsteps
I recorded these footstep sounds on the wooden floor of Futureworks' Custom Pre studio live room. I enjoy the percussive trebly clack to the these footsteps, but the mic also picked up a lot of trouser rustling noises from my jeans. Need to wear quieter trousers next time!
Carpet Footsteps
These sounds were recorded on the carpeted floor of the Custom Pre studio control room. Struggled to eliminate the background hum from this one; managed to get most of it out with some surgical EQ-ing, but lost some of the detail and top-end in the process.