Creating tip sounds for a webcam site

6 different sound effects for tips for an webcam site should be created.
Visitors are tipping performing models with different amount of tips, and each tip ranges should contain different sound effect played, according to their amount:
1-10 tokens
11-49 tokens
50-99 tokens
100-199 tokens
200-499 tokens
500+ tokens

1 token has value of around $0.1 (10c).

All the sounds should be built upon one sound (sound of tips would be provided). Sounds should be consistent and recognizable as a brand sounds of our site. Should at least differ in length. It is even possible to try to make a trill.
https://en.wikipedia.org/wiki/Trill_(music)

The bigger the tip, the stronger dynamics it should have, and it should last a bit longer. The sounds should motivate user to send tips to models.
The sounds should not sound like a slot machine, cashier machine, money or coins (should not sound cheap).

The sounds should not be copied from other similar sites, or from other sound banks, by any means, because of the licensing rights, and it is recommended to be generated from the ground up. The license to use them on the website should be included.