Hungry to learn more? Check out my skillshare page:
Getting Started Inkscape: http://skl.sh/2yzcHeE
Create Seamless Tiles in Inkscape: http://skl.sh/2y5Co23
7 Texture Examples: http://skl.sh/2BSr1OA
Yes I know, water isn't technically a texture. But here are some step by step instructions on how to create 3 examples of water 'textures'.
A simple preset filter:
Draw a blue rectangle
-Apply the filter Shaken liquid (Filters - Overlays - Shaken liquid)
A modified 3D wood filter:
-Apply the filter 3D wood (Filters - Materials - 3D wood)
-Open the filter editor
-Simply the filter by removing the first 2 Gaussian blurs, the specular lighting, the last two composites and the blend effects
-Set the frequency of the turbulence and amplify the displacement
-Change the flood color to white
-Increase the values of the convolution matrix corners to 5 and -5
A water filter from scratch:
-Add a new filter named water
-Add the turbulence effect
-Set the frequency to 0,06
-Amplify the opaque parts using a color matrix
-Add a composite effect to combine blue of the original with the transparent parts of the turbulence
-Add a light blue color
-Combine the light blue color with the blue turbulence using an arithmetic function
-Set k1 to 0,48, k2 to 0,66, k3 to 0,53 and k4 to -0,39
-Add a displacement effect with a scale of 24, and using the turbulence as the displacement map
-Use an offset to move the texture back to the middle
-Use a composite effect, or change the general settings, to cut off the edges of the texture