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psychaledic playground?

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Making the sun more "solid " would help the effect, and having the grass actually be opaque might be a good idea too.  I have yet to see transparent grass. ;-)

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The best hint I can give you on this would be to work more with textures.  You
can cut down on the number of objects by fooling the system with interesting 
bump maps or other types of textures.  The drawback is that lots of textures 
take very long to render.  Personally I think its worth it, since your images 
take on a whole new look when you use some really good textures.

BTW, 1 hour and 32min really isn't that long.  One of my images, with a large
number of nested textures, took over 5 days to render on a 486DX2/66 with 48M
of RAM.

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As seen by someone on acid who has just fallen down.  The swing seat texture
is a bit off, and the swing-set supports are somewhat too grainy.  Nice and
bright and colorful, though, and sort of surreal.

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impressionism with a touch of heat-stroke? Interesting.

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Colorful

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This scene exhibits a quasi-perfect balance between the vitriolic angst
of postmodern expressionism, and the ethereal bliss of expressionistic
postmodernism. The swingset located on the left employs a vibrant blend
of neo-techno-freudian surrealism to strike a vital dichotomy with the
flowing rhythm of the pyramidal grass. The clouds hover menacingly, unsure
of their final role in the chimerical diorama. The artist's clever yet
subtle hints of miasma are irreverently blurred by the nearly total
indifference to allegations of cubist dissent. It's groovy.