Maxon Cinema 4D is a 3D program mainly used for creating 3D models and objects.
But it can also be used to crate more simple things like resources for graphics, such as the ones below▼
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C4D Renders/Abstract C4D's, solid shapes with no background/transparent so you may place them freely on your creations without having to cut them out yourself or change the layer blend mode.
Used to cover up, wrap around and blend your subject render/stock, as well as for creating backgrounds.
Examples:




Creations including c4d renders:









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C4D Bubbles, fragments and circles looking like bubbles are used as effects to fill space and make your creations look fancier.
The layer "Blend Mode" in Photoshop for these effects need to be set to either "Lighten", "Screen" or "Linear Dodge", in order to blend with other images since the bubbles backgrounds are usually solid black.
Example:


Creations including c4d bubbles:





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C4D Effects are as the name says, effects. They are usually straight lines from the center and out, and used to build flow and lighting.
Same as with the bubbles, their backgrounds are also usually solid black, so their layer blend mode need to be changed as well.
Example:


Creations including c4d effects:










Click the images of the C4D examples and it will take you to the creators deviations, where you are able to download them.

All tags/sigs are created by me, but they are really old since I don't use C4D's in my creations anylonger. This is because I personally think C4D's are too overused, everyone uses it and you rarely see something new and original.
However using C4D's is a great way to learn how to make sigs/tags, since they are easy to use and work with. So don't let me stop you
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Here is examples on what Maxon Cinema 4D actually is developed for, 3D objects and models:

Plastic Society by mio188


Piano by mio188


Cloud_new_pose by Wen-JR

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If you want to download some more C4D renders and effects you may check our resource packs by Studio 9 and Talented Arts, and even deviantART's resource section.

Hope this helps and let me know if you have any further questions