The Natural Earth Gray Earth raster data set, reprojected to the U.S. National Atlas projection (a rotated Lambert azimuthal equal-area projection) via gdalwarp.
gdalwarp \
-r lanczos \
-ts 960 0 \
-t_srs EPSG:2163 \
-te -2100000 -2200000 2600000 750000 \
GRAY_HR_SR_OB_DR.tif \
shaded-relief.tiff