This list of files are in the textures folder of the Playground and can be loaded as Textures, CubeTextures or HDRCubeTextures
In the playground use
new BABYLON.Texture("textures/name", scene);
albedo.png --- 
amiga.jpg --- 
bloc.jpg --- 
candleopacity.png --- 
cloud.png --- 
co.png --- 
crate.png --- 
distortion.png --- 
earth.jpg --- 
equirectangular.jpg --- 
fire.png --- 
flare.png --- 
floor.png --- 
floor_bump.PNG ---
fur.jpg --- 
grass.jpg --- 
grass.png --- 
grassn.png --- 
ground.jpg --- 
heightMap.png --- 
heightMapTriPlanar.png --- 
impact.png --- 
invmask.png --- 
Logo.png --- 
mask.png --- 
misc.jpg --- 
mixMap.png --- 
normalMap.jpg --- 
orient.jpg --- 
palm.png --- 
player.png --- 
reflectivity.png --- 
rock.png --- 
rockn.png --- 
roundMask.png --- 
sand.jpg --- 
specmap.png --- 
specularglossymap.png --- 
sphereMap.png --- 
sun.png --- 
SunDiffuse.png --- 
tree.png --- 
walk.png --- 
waterbump.png --- 
worldHeightMap.jpg --- 
xStrip.jpg --- 
yStrip.jpg --- 
zStrip.jpg ---
CubeTextures are in groups of six for each side of the cube, each starting with a common name.
In the Playground use
new BABYLON.CubeTexture("textures/common part of names", scene);
skybox_nx.jpg --- 
skybox_nx.jpg --- 
skybox_ny.jpg --- 
skybox_px.jpg --- 
skybox_py.jpg --- 
skybox_pz.jpg ---
skybox2_nx.jpg --- 
skybox2_nx.jpg --- 
skybox2_ny.jpg --- 
skybox2_px.jpg --- 
skybox2_py.jpg --- 
skybox2_pz.jpg ---
skybox3_nx.jpg --- 
skybox3_nx.jpg --- 
skybox3_ny.jpg --- 
skybox3_px.jpg --- 
skybox3_py.jpg --- 
skybox3_pz.jpg ---
skybox4_nx.jpg --- 
skybox4_nx.jpg --- 
skybox4_ny.jpg --- 
skybox4_px.jpg --- 
skybox4_py.jpg --- 
skybox4_pz.jpg ---
TropicalSunnyDay_nx.jpg --- 
TropicalSunnyDay_nx.jpg --- 
TropicalSunnyDay_ny.jpg --- 
TropicalSunnyDay_px.jpg --- 
TropicalSunnyDay_py.jpg --- 
TropicalSunnyDay_pz.jpg ---
In the Playground use
new BABYLON.HDRCubeTexture("textures/name", scene);
country.hdr
environment.babylon.hdr
forest.hdr
night.hdr
parking.hdr
room.hdr