abstract apocalypse armageddon background blaze brimstone burning bushfire color colour danger desktop doomsday energy fantasy fear fire flame grass fire Ground Zero hades hell hot lava light nightmare powerful storm texture trouble turmoil volcanic wallpaper war atmosphere barrier breaking-through bright burn-off changing contrast dark darkening daylight discoloration fiery filtered fires halo hazardous Haze hazy health-hazard low-visibility skies sky smoke smokey smoky sunlight sunshine trees unhealthy visibility black coloration colored colorful colors coloured colourful colours fiery-sky firs-storm glowing golden intense intensity smoke-puffs spreading streaky textures thin vaporish vapourish variations warm wildfire wispy afterglow amber circle circular cloud heat red Australia buishfire clouds elements nature orange summer sunset