I took some photos today and made seamless textures from them. They are not scaled yet.
I hereby license the file crystal.png under the CC-BY license
I hereby license the file crystal2.png under the CC-BY license
I hereby license the file crystal3.png under the CC-BY license
I hereby license the file crystal4.png under the CC-BY license
I hereby license the file crystal5.png under the CC-BY license
I hereby license the file crystal6.png under the CC-BY license
I hereby license the file crystal7.png under the CC-BY license
I hereby license the file rock.png under the CC-BY license
I hereby license the file rock2.png under the CC-BY license
I hereby license the file rock3.png under the CC-BY license
I hereby license the file rock4.png under the CC-BY license
I hereby license the file rock5.png under the CC-BY license
I hereby license the file rock6.png under the CC-BY license
I hereby license the file rock7.png under the CC-BY license
I hereby license the file rock8.png under the CC-BY license
I hereby license the file rock9.png under the CC-BY license
I hereby license the file rock10.png under the CC-BY license
I hereby license the file crystal.png under the CC-BY license
I hereby license the file crystal2.png under the CC-BY license
I hereby license the file crystal3.png under the CC-BY license
I hereby license the file crystal4.png under the CC-BY license
I hereby license the file crystal5.png under the CC-BY license
I hereby license the file crystal6.png under the CC-BY license
I hereby license the file crystal7.png under the CC-BY license
I hereby license the file rock.png under the CC-BY license
I hereby license the file rock2.png under the CC-BY license
I hereby license the file rock3.png under the CC-BY license
I hereby license the file rock4.png under the CC-BY license
I hereby license the file rock5.png under the CC-BY license
I hereby license the file rock6.png under the CC-BY license
I hereby license the file rock7.png under the CC-BY license
I hereby license the file rock8.png under the CC-BY license
I hereby license the file rock9.png under the CC-BY license
I hereby license the file rock10.png under the CC-BY license
Attachment: crystal.png - Textures (2175k)
Attachment: crystal2.png - Textures (2234k)
Attachment: crystal3.png - Textures (242k)
Attachment: crystal4.png - Textures (3301k)
Attachment: crystal5.png - Textures (2202k)
Attachment: crystal6.png - Textures (4072k)
Attachment: crystal7.png - Textures (1295k)
Attachment: rock.png - Textures (1041k)
Attachment: rock2.png - Textures (1931k)
Attachment: rock3.png - Textures (2983k)
Attachment: rock4.png - Textures (1293k)
Attachment: rock5.png - Textures (1662k)
Attachment: rock6.png - Textures (994k)
Attachment: rock7.png - Textures (751k)
Attachment: rock8.png - Textures (791k)
Attachment: rock9.png - Textures (5544k)
Attachment: rock10.png - Textures (332k)

Where did you take them?

Additionally, they need some more processing to be able to use them in the game. Here is what needs to be done exactly:
* scale down so that they are not blurry anymore
* make them square
* make them tileable (I see you already did that, but on the base of a non-square image)
* save as JPEG

I did this intentionally, at least the part with leaving them too large. As for the blur, that's my camera, it is not very good. I can also upload the non-tileable pictures if anyone needs them. Anyway, I uploaded the pictures mostly unmodified so that someone who is more skilled in making textures can adjust them to their needs.
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