I am going to be creating a Scarecrow for Halloween this year as well.
I have ordered some Ink refill syringes for the fingers. The needles are very long and blunted at the end so they won't be a hazard
I have also ordered several orange pre-wired LEDs and Several orange glowsticks and glow necklaces for the hoses to the fingers.
Here is my suggestion that I will try to implement myself in the near future. It's kinda different.
I assume you will be creating a canister with an oval window in it.
I googled "Gel Bubbles" and found a large image that I tinted orange in photoshop.
• Print this out on clear acetate so it will be transparent to allow the LEDs to illuminate it.
• Tape or spray mount to the inside of the window in the tube
• Illuminate the canister with your LED's

May just work. The bubbles will be static, but they would also be in a real gel as well.
No weight at all! No danger of a mess due to leakage.
The image is large enough that you can rotate and use different orientations and portions of it for a seperate view of it in each canister.
I have ordered some Ink refill syringes for the fingers. The needles are very long and blunted at the end so they won't be a hazard
I have also ordered several orange pre-wired LEDs and Several orange glowsticks and glow necklaces for the hoses to the fingers.
Here is my suggestion that I will try to implement myself in the near future. It's kinda different.
I assume you will be creating a canister with an oval window in it.
I googled "Gel Bubbles" and found a large image that I tinted orange in photoshop.
• Print this out on clear acetate so it will be transparent to allow the LEDs to illuminate it.
• Tape or spray mount to the inside of the window in the tube
• Illuminate the canister with your LED's

May just work. The bubbles will be static, but they would also be in a real gel as well.
No weight at all! No danger of a mess due to leakage.
The image is large enough that you can rotate and use different orientations and portions of it for a seperate view of it in each canister.