Given a sentence in German, generate a new German sentence by performing small changes on the sentence. Here, make sure that the changes are semantically related and syntactically similar to the input. And the generated sentence should have high commonsense plausibility, that is to have reasonable probability of it being true.

Let me give you an example: Sie verwenden den Behälter, um Kohlenstoff zur Anlage zu transportieren.
The answer to this example can be: Sie arrangieren den Behälter, um Wasser an die Anlage zu versenden.
Here is why: This is a good example of a change in the input. The created sentence is semantically similar to the input as both are talking about giving water/carbon to a plant and the changes in the sentence follows the commonsense knowledge.

OK. solve this:
Sie können die Außenseite eines Rahmens malen, um seine Härte zu ändern.
Answer:
Sie können die Außenseite eines Stuhls malen, um seine Farbe zu ändern.