Though not true HDR, this procedure does give you more snap to your photos and art.
To go From This -- To This, do the following in Photoshop.
1. Open your photo
2. Filter > Unsharp >Unsharp Mask
-settings: Amount 40% / Radius 248px / Threshold 0
3. Duplicate the layer
4. Image > Adjustment > Hue/Saturation
-settings: Colorize unchecked / Hue 0 / Saturation -80% / Lightness 0
5. Set the Current Layer
settings: Opacity 25%
6. Set the Current Layer
7. Merge Visible Layers
8. Image > Adjustment > Hue/Saturation
-settings: Colorize unchecked / Hue 0 / Saturation 10% / Lightness 0
That's it. If it's too much for the photo, play with the hue and saturation settings. Sometimes it can become too bright or too dark.
Here is an example of this same method uses in an art piece. The piece is far from done, but you can see how it made it "pop" with color, shadow and detail.
And here is the piece in it's final aspect.