The Sims 2: FreeTime/Hobbies

There are several hobby objects in The Sims 2: FreeTime and it seems right that most can be found in the hobbies category.

The Formidable Formicarium
Once placed, the ant farm gets to work. Every three hours, tunnels will show to reflect the work being performed by the ants inside. After six hours, the ant farm is complete. To reset the ant farm use the Shake interaction on the ant farm.
 * Price: $185
 * Initial Depreciation: $27
 * Daily Depreciation: $18
 * Depreciation Limit: $74
 * Need Effects: Environment 2
 * Hobby: Science
 * Rooms: Study, Living
 * Community Sort: Miscellaneous

Interactions:
 * Observe Ants: Child or older can observe the ants for fun and science enthusiasm.
 * Shake: Sim shakes ant farm, reseting the interior to its original state. As well, there's a chance the ants will fall on your sim, causing the same effects as poison ivy i.e. drops is fun and comfort and stopping every-so-often to scratch.

One Man's Junk Car from Mechanically Minded
The restorable car must go through several stages before it can be used. There are two sections that must be worked on before you can paint the car; the engine and the body. When working on the engine, watch out for explosions as they cause the sim to stop working. When working on the body, you don't have to watch out for explosions but take care as this project really drains their needs. Once both parts are finished, choose a colour to paint the car. After that, it becomes a fully functional car that acts like the cars from The Sims 2: Nightlife.
 * Price: $800
 * Initial Depreciation: $120
 * Daily Depreciation: $80
 * Depreciation Limit: $320
 * Need Effects: Comfort 6, Energy 2, Fun 5
 * Skill: Mechanical
 * Hobby: Tinkering
 * Rooms: Outside

Interactions
 * Work on...:Choose between the body and the engine. The engine has three stages of completion but little explosions can knock your sim out of working on the car. If this happens, reperorm the interaction. The body has four stages of completion but your sim will work non-stop if their needs stay high enough.
 * Rev Engine: Sim gets in the car and tests the engine out. The effects correspond to the three stages of completion. Smoke means the engine is still in its first stage and no smoke indicates the second stage. The third stage is indicated by the completion of the engine.
 * Paint...:Select a colour to complete the car. If you don't like the colour you can actually re-decorate the car anytime you wish. After the car is painted, it spawns all the interactions as the cars introduced in The Sims 2: Nightlife. You can also sell the car, if you own Open for Business, on a business lot.