It works if you run the original sprites.planetmaker wrote: I have never tested that, but I assume that will fail nicely, if you try to replace OpenGFX sprites as I expect that you'll need to use appropriately named folders.
That is how I made this screenshot: http://www.tt-forums.net/viewtopic.php?f=29&t=47593
I never tried replacing OpenGFX sprites before but I did just now.
I tried putting those sprites in data/sprites/ogfx_toyland and that did not work.
But before posting the above,
I had a little looksie here: http://dev.openttdcoop.org/projects/ope ... ow/sprites and renamed my folder to ogfxt_toyland and success, it works.

So adding a few folders namely: ogfx1_base, ogfxc_artic, ogfxe_extra, ogfxh_tropical, ogfxi_logos and ogfxt_toyland and then putting the sprites in there should work.
As mentioned before the trg** folders can be used for replacing the original sprites if one is using those.

Thank you for making me make investigate this planetmaker.
ps:
For he who want to use this method, do not forget to remove those sprites after testing or you will be reporting bugs that are not in the OpenGFX sprites but in your data/sprites folder.