Good luck with it! This is something I've wanted to do for a long time. I found this list on the net years ago, and I'm sorry that I don't have who it came from. It's a good list!
Night bloomers
Cereus spp.
Datura wrightii "Sacred datura", "Jimson weed"
Echinopsis spp.
Hesperaloe nocturna
Moraea iridoides Fortnight lily
Oenothera caespitosa "Tufted evening primrose"
Peniocereus greggii "Queen of the night"
White/pale blue flowered perennials
Asclepias linaria "Pineleaf milkweed"
Bauhinia lunarioides (congesta) "Anacacho orchid tree"
Convolvulus cneorum "Bush morning glory"
Cordia boissieri "Texas olive"
Cordia parvifolia "Little leaf cordia"
Gaura lindheimeri "Gaura"
Jasminum sambac "Arabian jasmine"
Lantana montevidensis (white)
Lonicera japonica v. halliana "Japanese honeysuckle"
Moraea iridoides Fortnight lily
Plumbago auriculata
Plumbago scandens "Plumbago"
Ruellia brittoniana w/white flowers
Trachelospermum jasminioides "Star jasmine"
Zephyranthes candida
Zinnia acerosa "Desert zinnia"
Gray foliage plants
Acacia aneura "Mulga"
Acacia cultriformis
Artemisia ludoviciana "Western mugwort"
Asclepias subulata "Desert milkweed"
Atriplex canescens "Fourwing saltbush"
Atriplex hymenelytra "Desert holly"
Atriplex lentiformis "Quail brush"
Atriplex nummularia "Old man saltbush"
Bahia absinthifolia "Bahia"
Baileya multiradiata "Desert marigold"
Brahea armata "Blue hesper palm"
Buddleia marrubifolia "Wooly butterfly bush"
Cassia artemisioides "Desert cassia"
Convolvulus cneorum "Bush morning glory"
Cupressus arizonica "Arizona cypress" "Sabino"
Dalea greggii "Trailing indigo bush"
Dalea pulchra "Bush dalea"
Eremophila cv. Valentine "Emu bush"
Euphorbia rigida "Gopher weed"
Gazania rigens v. leucolaena "Trailing gazania"
Hyptis emoryi "Desert lavender"
Lavandula species "Lavender"
Leucophyllum pruinosum "Fragrant rain sage"
Olea europea cv. Swan Hill "Swan Hill olive"
Pedilanthus macrocarpus "Slipper plant"
Perovskia atriplicifolia "Russian sage"
Psorothamnus spinosus "Smoke bush"
Salvia clevelandii "Cleveland sage"
Santolina chamaecyparissus "Lavender cotton"
Simmondsia chinensis "Jojoba"
Sophora secundiflora "Texas mountain laurel" (Silver Peso)
Teucrium fruticans "Bush germander"
Yucca rigida "Blue yucca"
White barked trees
Acacia willardiana "Palo blanco"
Eucalyptus erythronema "Red-flowered mallee"
Eucalyptus papuana (aparrerinja) "Ghost gum"
Accent plants for lighting and shadow effects
Cereus peruvianus (and v. Monstrosus)
Cleistocactus spp.
Dasylirion wheeleri "Desert spoon"
Nolina microcarpa "Beargrass"
Oreocereus spp. "Old man of the Andes"
Pedilanthus macrocarpus "Slipper plant"
Yucca elata "Soaptree yucca"
Yucca rigida "Blue yucca"
White/pale blue flowered annuals
Antirrhinum varieties "Snapdragon"
Cyclamen varieties "Cyclamen"
Lobularia varieties "Sweet alyssum"
Matthiola varieties "Stock"
Papaver nudicaule "Iceland poppy"
Petunia varieties "Petunia"
Viola varieties "Viola, Violet, Pansy"
