This is not completely certain.
Because as long as someone else registers this appearance as a patent, you can no longer use it.
But it is difficult for ordinary people. Check whether the graphics you are using have been registered.
So, it is better to be careful when using things designed by others. It is best not to use them directly for commercial design. If you just use them for practice, just use them for yourself. It doesn't matter. If the modification is very large and the original graphics can't be seen, it's okay.