Erase Some Triangles and Add a Drop Shadow

Finished 'Cinco de Mayo' with drop shadow added.

Right click each layers on Layer palette and select 'Convert to Raster Layer'.

Before attempting to erase the unwanted portions of orange triangles, select the layer with the green outline and use Magic Wand to select just the green outline. Switch back to layer with orange triangles and, with Eraser tool, erase portions of triangles that are suppose to be hidden by overlapping letters. The selection made with Magic Wand will help you stay 'in the lines'.

Select 'none'. Erase any stray bits of orange that may have been left behind. At this point you can also erase the 'extra' group of 3 triangles that was set aside 'just in case' they were needed.

Zoom back to normal size.

Merge visible and add a drop shadow. First, hide visibility for raster background (if there is one) so it won't be included in merge. Then select text layer, right click, select 'Merge > Merge visible'. (You can turn visibility for background back on now.)

Add drop shadow. Effects > 3D Effects > Drop Shadow
Vertical: 4
Horiz: 4
Opacity: 40
Blur: 4
Color: Black
Un-check 'Shadow on new layer'.

Next we'll add a background banner.