I had a look at both those videos and some ideas to get you started are...

TV static can be recorded from the tv, either onto a dvd recorder or just point the camera at the screen and record it. Just make sure the camera is on a tripod and avoid any lights or shadows falling on the screen.

The cover of the water well being moved out could be done using animated graphics in AE.

Water with red dye in it or add the colour in post production again using AE.

Picture in picture.

A visit to the butchers shop and buy a pound of sausages, use four, put three in your mouth, and have someone hold one, shout ACTION, and get the person to slowly pull them out of your mouth.

Maggotts, a trip to the local fly fishing shop, what you would do with them after your video is made I have no idea.

Centipede, make a small scale model of a table, chair and glass of water, again another trip to the pet shop.

The burning tree - probably a still image with either a flame particle effect on the branches or an animated gif with trasparent bg, copied and repeated many times.

Time lapse clouds. Put the camera on a tripod and point it skywards, but not at the sun. Record 10 minutes of clouds and then in your editor or effects program, speed the video up so it goes from 10 minutes down to about 10 seconds in length.

The moose's head, try the prop dept at the BBC, I'm sure it's there in some dark dusty corner after it was used in Fawlty Towers.