This is a great collection of silicone forms.

Great for baking/soap making/ ice cubes etc

These are not made by LEGO but are LEGO shaped.

The large minifigure silicone cake and chocolate mold Material:
Flexible, food-grade silicone Oven and microwave safe - min. approx. 20°C (68°F)
- max. 230°C (450°F). Dishwasher safe - max. 65°C (150°F). Measures over 12" (30 cm) long, 8" (20 cm) wide and 2" (5 cm) high.